Suction gas guiding system for reciprocating compressor

ABSTRACT

A suction gas guide system ( 100 ) for reciprocating compressor ( 30 ) comprises a gas guide conduit having both ends installed on a suction pipe (SP) of a shell ( 10 ) and on an inner flowing passage of a piston ( 31 ) so as to face each other and guiding sucked gas inside the shell ( 10 ) to the inner flowing passage of the piston ( 31 ), whereby a refrigerant gas is sucked into the gas flowing passage of the piston ( 31 ) through the gas guide conduit ( 100 ) smoothly. Accordingly, suction rate of the refrigerant gas is increased, moreover, noise and vibration generated during suction of the refrigerant gas are reduced, and therefore flow resistance for the noise and the sucked gas is reduced, whereby the reliability and efficiency of the compressor is increased. Also, the pre-heating of the gas by the motor ( 20 ) is prevented, and then increase of the specific volume of the gas is prevented, and thereby the efficiency of the compressor ( 30 ) is increased.

TECHNICAL FIELD

The present invention relates to a suction gas guiding system for areciprocating compressor, and particularly, to a suction gas guidingsystem for a reciprocating compressor which is suitable for introducingsuction gas into a compressor unit smoothly, and for reducing suctionnoise in case of installing the compressor unit inside a reciprocatingmotor.

BACKGROUND ART

Generally, a reciprocating compressor can be divided into a compressorwhich compresses and discharges the sucked gas by changing a rotatingmovement of a driving motor into a reciprocating motion of a piston, anda compressor which compresses and discharges the sucked gas by makingthe piston undergo reciprocating movement while the driving motorundergoes linear reciprocating movement.

FIG. 1 is a transverse cross-sectional view showing an embodiment of thereciprocating compressor in which the driving motor undergoes the linearreciprocating movement.

As shown therein, a conventional reciprocating compressor comprises ashell 10 in which a suction pipe (SP) and a discharge conduit (DP) arecommunicated with each other; a reciprocating motor 20 fixed inside theshell 10; a compressor unit 30 installed inside the reciprocating motor10, sucking, compressing, and discharging gas; a frame unit 40supporting the reciprocating motor 20 and the compressor unit 30; and aspring unit 50 elastically supporting an armature 22 of thereciprocating motor 20 in motion direction and guiding a resonance.

The reciprocating motor 20 includes a stator 21 including an innerstator 21A and an outer stator 21B, and an armature 22 disposed in a gapbetween the inner stator 21A and the outer stator 21B and undergoing areciprocating movement.

The compressor unit 30 comprises a piston 31 coupled to a magnetsupporting member 22A of the reciprocating motor 20 and undergoing thereciprocating movement together with the magnet supporting member 22A; acylinder 32 fixed on a front frame 41 which will be described later, andforming a compressing space with the piston; a suction valve 33installed on front end of the piston and restricting the suction of gasby opening/closing a gas passing hole 31 b of the piston which will bedescribed later; and a discharge valve assembly 34 disposed on the frontend of the cylinder 32, whereby covering the compressing space, andrestricting the discharge of compressed gas.

An inner flowing passage 31 a communicating with the suction pipe (SP)is formed to a certain depth inside the piston 31, and the gas passinghole 31 b communicated with the inner flowing passage 31 a andpenetrated to front end surface of the piston 31 is formed.

The frame unit 40 includes a front frame 41 contacting to front surfacesof the inner stator 21A and of the outer stator 21B, whereby supportingthe stators together, and in which the cylinder 32 is inserted; a middleframe 42 contacting to rear surface of the outer stator 21B, wherebysupporting the outer stator 21B; and a rear frame 43 coupled to themiddle frame 42 and supporting rear end of a rear spring 52 which willbe described later.

The spring unit 50 includes front spring 51 having both ends supportedby the front surface of coupled part of the magnet supporting member 22Aand the piston 31 and by the corresponding inner surface of the frontframe 41, and a rear spring 52 having both ends supported by rearsurface of the coupled part of the magnet supporting member 22A and thepiston 31, and by corresponding front surface of the rear frame 43.

Reference numeral 22B designates a magnet.

The conventional reciprocating compressor as described above is operatedas follows.

That is, when an electric current is applied to the winding coil 21Cinstalled on the outer stator 21B of the reciprocating motor 20 and aflux is generated between the inner stator 21A and the outer stator 21B,whereby the armature 22 located in the gap between the inner stator 21Aand the outer stator 21B moves in accordance with the direction of theflux and undergoes reciprocating movement by the spring unit 50. Andaccordingly, the piston 31 coupled to the armature 22 undergoesreciprocating movement inside the cylinder 32, so that a volume varianceis generated inside the compressing space, accordingly the refrigerantgas is sucked into the compressing space, then compressed anddischarged.

The refrigerant gas is sucked inside the shell 10 through the suctionpipe (SP) during the suction stroke of the piston, and the gas is suckedinto the compressing space of the cylinder 32 as opening the suctionvalve 33 through the inner flowing passage 31 a of the piston 31 andthrough the gas passing hole 31 b. Then, the gas is compressed to acertain level during the compress stroke of the piston, and dischargedthrough the discharge conduit 34 as opening the discharge valve assembly34. And the whole process is repeated.

However, in the conventional reciprocating compressor as describedabove, the refrigerant gas sucked into the shell 10 through the suctionpipe (SP) is dispersed inside the shell 10, whereby the density per unitvolume is lowered. Accordingly, the actual amount of refrigerant gassucked into the compressing space during the reciprocating movement ofthe piston 31 is low, whereby the efficiency of the compressor islowered.

Also, the refrigerant gas sucked into the shell 10 is pre-heated bycontacting to the reciprocating motor 20 inside the shell 10, and thenthe gas is sucked into the compressing space. Therefore, the specificvolume of the refrigerant gas is increased, and the performance of thecompressor is lowered.

Also, when the suction valve 33 is opened/closed, the suction valve 33is impacted to the front end surface of the piston 31, whereby theimpact noise generated thereof is transferred to inside of the shell 10entirely, and the noise of the entire compressor is increased.

In addition, when the suction valve 33 is opened/closed, thecounter-flowing refrigerant gas is impacted with the sucked refrigerantgas instantaneously, whereby a pressure pulsation is generated. And thepressure pulsation is transferred to the suction pipe (SP) through theinner flowing passage 31 a of the piston 31, and thereby the suction ofthe refrigerant gas is disturbed and the efficiency of the compressor islowered.

DISCLOSURE OF THE INVENTION

Therefore, to solve the problems of the conventional art, it is anobject of the present invention to provide a suction gas guide systemfor a reciprocating compressor which increase efficiency of thecompressor by introducing sucked gas inside a shell to a compressingspace, and thereby increasing a density of the refrigerant gas per unitvolume.

Also it is an another object of the present invention to provide asuction gas guide system for a reciprocating compressor which is able toincrease the efficiency of the compressor by preventing the sucked gasfrom being pre-heated before introduced into the compressing space andthereby preventing the increase of a specific volume of the gas.

In addition, it is still another object of the present invention toprovide a suction gas guide system for a reciprocating compressor whichis able to reduce the noise of the compressor by attenuating an impactnoise generated from impact of the suction valve to a front end surfaceof the piston when the refrigerant gas is sucked.

Also it is still another object of the present invention to provide asuction gas guide system for a reciprocating compressor which is able tosuck the refrigerant gas smoothly by attenuating a pressure pulsationgenerated from opening/closing of the suction valve.

To achieve these objects of the present invention, there is provided areciprocating compressor including a shell in which a suction pipe and adischarge conduit are communicated with each other; a reciprocatingmotor including a stator comprising an inner stator and an outer statorwhich are fixed inside the shell having a certain air gap, and anarmature disposed in the air gap between the two stators and undergoinga reciprocating movement; a compressor unit including a piston coupledto the armature of the reciprocating motor, undergoing the reciprocatingmovement together with the armature, and having an inner flowing passageis formed penetrating inside the piston, and a cylinder supported insidethe reciprocating motor so as to form a compressing space by insertingthe piston inside the cylinder; a frame unit supporting thereciprocating motor and the compressing unit; and a spring unitelastically supporting the armature of the reciprocating motor in motiondirection, wherein a suction gas guide system including a gas guideconduit having both ends installed to oppose from each other in thesuction pipe and in the inner flowing passage, and introducing the gassucked into the shell through the suction pipe to the inner flowingpassage of the piston is provided.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a transverse cross-sectional view showing a conventionalreciprocating compressor;

FIG. 2 is a transverse cross-sectional view showing a reciprocatingcompressor according to the present invention;

FIG. 3 is a transverse cross-sectional view showing the reciprocatingcompressor centering around a suction gas guide system according to thepresent invention;

FIG. 4 is an exploded perspective view showing the suction gas guidesystem of the reciprocating compressor according to the presentinvention;

FIG. 5 is a transverse cross-sectional view showing an operating stateof the reciprocating compressor according to the present invention;

FIG. 6 is a transverse cross-sectional view showing an operating stateof the reciprocating compressor according to the present invention;

FIG. 7 is a transverse cross-sectional view showing an anotherembodiment of the suction gas guide system of the reciprocatingcompressor according to the present invention;

FIG. 8 is a transverse cross-sectional view showing an anotherembodiment of the suction gas guide system of the reciprocatingcompressor according to the present invention;

FIG. 9 is a transverse cross-sectional view showing an anotherembodiment of the suction gas guide system of the reciprocatingcompressor according to the present invention;

FIG. 10 is a transverse cross-sectional view showing an anotherembodiment of the suction gas guide system of the reciprocatingcompressor according to the present invention; and

FIG. 11 is a transverse cross-sectional view showing an anotherembodiment of the suction gas guide system of the reciprocatingcompressor according to the present invention.

MODES FOR CARRYING OUT THE PREFERRED EMBODIMENTS

Hereinafter, the suction gas guide system of the reciprocatingcompressor according to the present invention will be described withreference to the accompanying drawings.

As shown in FIG. 2, the reciprocating compressor including the suctiongas guide system according to the present invention comprises a shell 10in which a suction pipe (SP) and a discharge conduit (DP) arecommunicated; a reciprocating motor 20 fixed inside the shell; acompressing unit 30 installed inside the reciprocating motor, sucking,compressing and discharging a gas; a frame unit 40 supporting thereciprocating motor 20 and the compressor unit 30; a spring unit 50elastically supporting an armature 22 of the reciprocating motor 20 in amotion direction and guiding a resonance; and gas guide unit 100installed between the compressing unit 30 and the frame unit 40, andguiding the sucked gas.

The reciprocating motor 20 includes a stator 21 comprising an innerstator 21A and an outer stator 21B, and an armature 22 disposed in anair gap generated between the inner stator 21A and the outer stator 21Band undergoing a reciprocating movement.

The compressor unit 30 includes a piston 31 coupled to the magnetsupporting member 22A of the reciprocating motor 20, and undergoingreciprocating movement together; a cylinder 32 fixed to a front frame41, which will be described later, so that the piston inserted into thecylinder slidably, and forming a compressing space with the piston; asuction valve 33 installed on the front end of the piston 31 andrestricting suction of the gas by opening/closing a gas passing hole 31b of the piston 31, which will be described later; and a discharge valveassembly 34 installed on front end surface of the cylinder 32, coveringthe compressing space, and restricting discharge of the compressed gas.

An inner flowing passage 31 a communicated with the suction pipe (SP) isformed to have a certain depth inside the piston 31, and a gas passinghole 31 b communicating with the inner flowing passage 31 a andpenetrated to the front end surface of the piston is formed inside thepiston 31.

The frame unit 40 includes a front frame 41 contacting to front surfacesof the inner stator 21A and of the outer stator 21B, whereby supportingthe two stators together, and having a cylinder inserted and coupled tothe front frame 41; a middle frame 42 contacting to the rear surface ofthe outer stator 21B and supporting the outer stator 21B; a rear frame43 coupled to the middle frame 42 and supporting a rear end of a rearspring which will be described later.

The spring unit 50 includes a front spring 51 having both ends supportedby a front surface of the coupled part of a magnet supporting member 22Aand of the piston 31, and by an inner surface of the front frame 41,respectively; and a rear spring 52 having both ends supported by a rearsurface of the coupled part of the magnet supporting member 22A and ofthe piston 31, and by a corresponding front surface of the rear frame43, respectively.

The gas guide unit 100 may include a guide conduit, or may include twoor more guide conduits. Herein, a gas guide unit including two guideconduits will be described.

As shown in FIGS. 3 and 4, the gas guide unit 100 includes a first guideconduit 110 coupled to the piston 31 so as to be inserted into the innerflowing passage 31 a of the piston 31; and a second guide conduit 120inserted inside the first guide conduit 110 so that a front side of thesecond guide conduit 120 is overlapped at a certain range and coupled ona same axial line with the first guide conduit.

The first guide conduit 110 is fixedly screwed using a volt (not shown)on a flange unit 31 c formed on rear end of the piston 31 so as to becoupled to the magnet supporting member 22A, and the second guideconduit 120 is fixedly screwed using a volt (not shown) on an innersurface of the rear frame 43 of the frame unit 40.

An outer diameter of the first guide conduit 110 is formed shorter thanan inner diameter of the inner flowing passage 31 a of the piston, sothat there is a first resonant space (S1) between the outer surface ofthe first guide conduit 110 and the corresponding inner surface of thepiston 31. In addition, the rear end of the first guide conduit 110abuts to the flange unit 31 c formed on the rear end of the piston 31,but the front end of the first guide conduit 110 communicates with theinner flowing passage 31 a because the length of the first guide conduit110 is shorter than that of the entire inner flowing passage 31 a formedinside the piston 31.

Also, on the front end of the first guide conduit 110, an outward flangeunit 111 toward the inner circumferential wall of the inner flowingpassage 31 a so that the entrance of the first resonant space (S1) isstepped.

On the other hand, the second guide conduit 120 includes a large conduitunit 121 fixed to the rear frame 43, and a small conduit unit 122coupled to the front side of the large conduit unit 121 and insertedinto the first guide conduit 110.

The large conduit unit 121 includes a baffle unit 121A dividing theinside of the large conduit unit 121 into a plurality of resonant spaces(S2 and S3) is installed at least one (a baffle unit is shown inFigure), and it is desirable that the baffle unit 121A is installed in avertical direction against the flowing direction of the gas.

Also, the large conduit unit 121 includes the baffle unit 121A; a firstconduit unit 121B and a second conduit unit 121C forming a body with thebaffle unit 121A and forming a second resonant space (S2) and a thirdresonant space (S3) by coupling both sides of the baffle unit 121A; anda first side plate unit 121D and a second side plate unit 121E couplingto the other sides of the first and second conduit unit 121B and 121C,respectively.

Outer diameters of the first conduit unit 121B and the second conduitunit 121C are formed same as those of the baffle unit 121A and therespective side plate units 121D and 121E, and bores 121 a, 121 d, and121 e are formed in a central part of the baffle unit 121A and of therespective side plate units 121D and 121E at the same axial line withthose of the suction pipe (SP), the small conduit unit 122, and theinner flowing passage 31 a.

The first side plate unit 121D is located on front side of the largeconduit unit 121, in which the small conduit unit 122 is coupled on itsbore 121 d, and a flange unit (not defined as a reference numeral)coupled to the rear frame 43 is formed on the second side plate unit121E.

Also, it is desirable that an inner edge of the entrance of the smallconduit unit 122 is formed round. In addition, the first conduit unit121B and the first side plate 121D may be formed as a single body, andthe other members are able to be welded by an ultrasonic welding or abrazing method.

Same components as those of the conventional art are designated by thesame reference numerals.

Reference numeral 22B designates a magnet.

The suction gas guide system of a reciprocating compressor according tothe present invention has effects as follows.

That is, when an electric source is applied to the reciprocating motor20, accordingly a flux is formed between the inner stator 21A and theouter stator 21B, whereby the armature 22 with the piston 31 moves inaccordance with the direction of the flux and undergoes linearreciprocating movement by the spring unit 50. Then, the piston 31coupled to the armature 22 undergoes the linear reciprocating movementinside the cylinder 32 so that a pressure variance is repeatedlygenerated inside the cylinder 32. Accordingly, due to the pressurevariance inside the cylinder 32, the refrigerant gas is sucked into thecompressing space of the cylinder 32 through the inner flowing passage31 a in the piston 31, then compressed and discharged. And this processis repeated.

Hereinafter, the process will be described in more detail.

First, as shown in FIG. 5, the refrigerant gas (indicated as the realline arrow in drawing) is sucked and charged inside the shell 10 throughthe suction pipe (SP) during the suction stroke of the piston 31, andafter that, the refrigerant gas charged in the shell 10 is sucked intothe compressing space of the cylinder 32 as opening the suction valve 33through the large conduit unit 121 and the small conduit unit 122 of thesecond guide conduit 120, the first guide conduit 110, and the gaspassing hole 31 b on the inner flowing passage 31 a of the piston 31during the continued suction stroke of the piston 31.

At that time, before the refrigerant gas sucked into the shell 10 isdispersed entire shell 10, the gas is guided to the inner flowingpassage 31 a of the piston through the respective guide conduits 110 and120, and the refrigerant gas guided into the inner flowing passage 31 ais directly sucked into the compressing space as opening the suctionvalve 33 through the gas passing 31 b, whereby the density of the gasper unit volume is increased, and therefore the efficiency of thecompressor is able to be increased.

Also, as the refrigerant gas sucked into the shell 10 through thesuction pipe (SP) is guided to the compressing space of the cylinder 32through the gas guide unit 100, a direct contact of the gas to the motorcan be prevented to a certain extent. And thereby increase of thespecific volume of the refrigerant gas is able to be restrained, andaccordingly, the amount of sucked gas is increased, whereby theefficiency of the compressor can be increased.

Also, the first guide conduit 110 and the second guide conduit 120 ofthe gas guide unit 100 are disposed to be overlapped always when thepiston 31 undergoes the reciprocating movement, and therefore theleakage of the refrigerant gas during the suction of the gas is able tobe reduced. Accordingly, the suction rate of the refrigerant gas isincreased, whereby the efficiency of, the compressor also is able to beincreased.

Also, the suction pipe (SP), the first guide conduit 110 and the secondguide conduit 120 are disposed at the same axial line, especially, eventhough the large conduit unit 121 is located on the sucking side of thesecond guide conduit 120, the connecting part of the large conduit unit121 and the small conduit unit 122 is formed as round, whereby therefrigerant gas is directly sucked into the compressing space of thecylinder 32 through the suction pipe (SP). Therefore, the suction rateof the refrigerant gas is increased, and the efficiency of thecompressor can be increased.

After that, as shown in FIG. 6, the refrigerant gas in the compressingspace of the cylinder 32 is compressed during the compressing stroke ofthe piston 31, and then the gas is discharged as opening the dischargevalve 34.

At that time, the suction valve 33 opened during the suction of therefrigerant gas is closed, and then the suction valve 33 is impacted tothe front surface of the piston 31, whereby an impact noise (indicatedas dotted line arrows in drawing) between the valve 33 and the piston 31is generated. And the noise is flows to the opposite of the suctiondirection of the gas, but the noise of low frequency is attenuated inthe first resonant space (S1) formed between the inner flowing passage31 a of the piston and the first guide conduit 110, and the noise ofhigh frequency is attenuated through the second resonant space (S2) andthe third resonant space (S3) formed on the large conduit unit 121 inthe second guide conduit 120, whereby the reliability of the compressoris increased.

Also, as the suction valve 33 is opened/closed, some of the refrigerantgas being sucked is counter flown, and accordingly the counter-flowingrefrigerant gas causes a pressure pulsation by impact with therefrigerant gas being sucked through the inner flowing passage 31 a ofthe piston 31. Then, the pressure pulsation disturbs the suction of therefrigerant gas by flowing to the opposite of the suction direction.However, the pressure pulsation is somewhat attenuated with the impactnoise while flowing through the respective resonant space (S1, S2, andS3), whereby the amount of the refrigerant gas newly sucked is able tobe increased, and the efficiency of the compressor can be increased.

In addition, the large conduit unit 121 is fixed on the rear frame 43and does not move with the reciprocating movement of the piston 31, andtherefore the flow resistance is restrained and the efficiency of thecompressor is able to be increased.

Moreover, when the gas guide unit 100 is assembled, the large conduitunit 121 is molded as separated members and fabricated by the ultrasonicwelding or by the brazing, and after that the large conduit unit 121 isassembled. Therefore the assembling process of the gas guide unit 100 ismade in simple way, whereby the productivity can be increased.

Hereinafter, the another embodiment of the suction gas guide system fora reciprocating motor according to the present invention will bedescribed.

In the embodiment described above, the first guide conduit 110 and thesecond guide conduit 120 are fixed on the piston 31 and on the frame 43respectively as separate bodies. However, in the present embodiment asshown in FIG. 7, a first guide conduit 210 and a second guide conduit220 may be fixed on the piston 31 together, or as shown in FIG. 8, afirst guide conduit 310 and a second guide conduit 320 may be fixed onthe frame 43 together.

As for the embodiment shown in FIG. 7, in case that the first guideconduit 210 and the second guide conduit 220 are fixed on the piston 31,the first guide conduit 210 is formed extending forward so as to beinserted in the inner flowing passage 31 a, and the second guide conduit220 is formed extending backward so as to oppose against the suctionpipe (SP) of the shell 10 and to be overlapped with the bore 43 aincluded in the frame 43 in a certain range.

Also, the first guide conduit 210 is formed to have an outer diametershorter than the inner diameter of the piston 31 so that the outersurface of the first guide conduit 210 and the inner surface of thepiston 31 form the first resonant space (S1), and an outward flange unit211 is formed on front end of the first guide conduit 210.

On the contrary, the said large conduit unit 221 is formed on thecoupled part with the piston 31 of the second guide conduit 220, and thesaid baffle unit 221A is formed on the large conduit unit 221. Asdescribed in the above embodiment, the large conduit unit 221 includesthe baffle unit 221A; a first conduit unit 221B and a second conduitunit 221C coupled on both sides of the baffle unit 221A whereby formingthe second resonant space (S2) and the third resonant space (S3); and afirst side plate unit 221D and a second side plate unit 221E coupled tothe other sides of the first conduit unit 221B and the second conduitunit 221C.

Herein, it is desirable that the inner edge of the first guide conduit210 entrance is formed roundly. In addition, in the large conduit unit221 in the second guide conduit 220, the second conduit unit 221C andthe second side plate unit 221E may be formed as a single body, and restcomponents can be able to be coupled by using ultrasonic welding orbrazing.

As described above, in case that the first and second guide conduit 210and 220 are all coupled to the piston 31, the first and second guideconduit 210 and 220 undergo the reciprocating movement along with thatof the piston 31, whereby the conduits 210 and 220 guide the refrigerantgas sucked into the shell 10 to the compressing space of the cylinder32. At this time, as the first and second guide conduit 21 and 220 arecoupled together to the piston 31, the leakage of the refrigerant gasbetween the conduits 210 and 220 is prevented, and therefore the amountof sucked gas can be increased.

And the respective effects described in the above embodiment are similarwith those of the present embodiment, and accordingly, the descriptionfor that is omitted.

As shown in FIG. 8, in case that the first guide conduit 310 and thesecond guide conduit 320 are all fixed on the frame 43, the largeconduit unit 321 including the baffle unit 321A is formed on the firstguide conduit 310, and a extended unit 331 may be formed on the secondguide conduit 320 so as to be inserted in the bore 43 a of the rearframe 43.

The first guide conduit 310 includes a large conduit unit 321 fixed oninner surface of the rear frame 43, and a small conduit unit 322 coupledto front side of the large conduit unit 321 and inserted into the innerflowing passage 31 a.

Also, it is desirable that the first guide conduit 310 is always locatedinside the range of the inner flowing passage 31 a when the piston 31undergoes reciprocating movement, and the distance (a) from the end ofthe inner flowing passage 31 a of the piston 31 to the front end of thesmall conduit unit 312 is shorter than the distance (b) between the rearside surface of the inner stator 21A and the inner surface of the magnetsupporting member 22A because the first guide conduit 310 is fixed onthe frame 43 apart from the piston 31.

The large conduit unit 321 includes the baffle unit 321A; a firstconduit unit 321B and a second conduit unit 321C forming a body unitwith the baffle unit 321A and coupled to both sides of the baffle unit321A whereby forming the second resonant space (S2) and the thirdresonant space (S3); and a first side plate unit 321D and a second sideplate unit 321E coupled to the other sides of the first and secondconduit units 321B and 321C, respectively.

The first side plate unit 321D is located on front side of the largeconduit unit 321 having a small conduit unit 322 coupled to its bore(not defined). And a flange unit (not defined) coupled to the rear frame43 is formed on the second side plate unit 321E.

Also, the first conduit unit 321B and the first side plate unit 321D maybe formed as a single body, and rest members may be welded and coupledby using ultrasonic welding or brazing method.

It is desirable that an inner edge of the entrance end of the smallconduit unit 322 is formed roundly.

On the other hand, an extended unit 321 penetrating the rear frame 43 asdescribed above is formed extending from the flange unit (not defined)fixed on the rear frame 43 in the second guide conduit 320.

In that case, the first and second guide conduits 310 and 320 are allfixed on the frame, that is, a fixed body, accordingly, the weight ofthe piston 31 as an armature is reduced, whereby the efficiency of themotor is increased, moreover, a flow resistance is reduced.

The present embodiment has similar structure and effects as those of theembodiments described above, and the descriptions for that will beomitted.

Hereinafter, the another embodiment of the present invention will bedescribed.

The gas guide unit in the embodiments described above includes the firstguide conduit and the second guide conduit, however, in the presentembodiment, the gas guide unit further includes an intermediate guideconduit between the first and second guide conduits. As shown in FIG. 9,the intermediate guide conduit 430 is installed on rear side of thefirst guide conduit 410 fixed on the piston 31, and the second guideconduit 420 inserted into the intermediate guide conduit 430 slidably isfixedly coupled to the frame 43.

The first guide conduit 410 is formed extending from the rear side ofthe piston 31 toward the frame 43, and a diameter of the first guideconduit 410 is formed larger than that of the inner flowing passage 31 aof the piston 31 so as to perform as the large conduit unit 411.

A baffle unit 411A dividing inside of the first guide conduit 410 into aplurality of resonant spaces (S2 and S3) is located in intermediate partof the first guide conduit 410. In addition, the first conduit unit 411Band the second conduit unit 411C are installed on both sides of thebaffle unit 411A, the first side plate unit 411D is installed on frontsurface of the first conduit unit 411B, and a connecting plate unit 411Eforming the second side plate unit and connectively supporting theintermediate guide conduit 430 is installed on rear surface of thesecond conduit unit 41C.

It is desirable that the intermediate guide conduit 430 is installed atsame axial line of the suction pipe (SP), the second guide conduit 420,and the inner flowing passage 31 a of the piston 31.

Also, it is desirable that the inner diameter of the intermediate guideconduit 430 is formed larger than the outer diameter of the second guideconduit 420 so that the second guide conduit 420 is inserted into theintermediate guide conduit 430 slidably.

The rear end of the second guide conduit 420 is fixed on inner surfaceof the frame 43 and extended toward the piston 31, and the front end ofthe second guide conduit 420 is inserted so as to be overlapped with themiddle guide conduit 430 always.

The effects of the present embodiment are similar with those of theembodiments described above, and therefore detailed descriptions forthat are omitted.

On the other hand, the gas guide unit may include a plurality of largeconduit unit as shown in FIGS. 10 and 11.

That is, the embodiment shown in FIG. 10 includes a second large conduitunit 421 formed on one side of the second guide conduit 420 in theembodiment shown in FIG. 9. In that case, the second large conduit unit421 is assembled in same way as that of the large conduit unit 411 ofthe first guide conduit 410, that is, the baffle unit 421A, the firstconduit unit 421B, the second conduit unit 421C, the first side plateunit 421D, and the second side plate unit 421E are coupled by assemblingthem after separately molded.

Herein, the second guide conduit 420 includes the second large conduitunit 421 and a second small conduit unit 422 as described above, and thefirst conduit unit 421B and the first side plate unit 421D of the secondlarge conduit unit 421 are formed as a single body, if necessary, andthe other components may be coupled by using the ultrasonic welding orbrazing. Also, it is desirable that the inner edge of the entrance ofthe second small conduit unit 422 is formed roundly.

On the other hand, as shown in FIG. 11, the first guide conduit 410 mayinclude a first small conduit unit 412 inserted inside of the piston 31on the front side.

In that case, it is desirable that the outer diameter of the first smallconduit unit 412 is formed shorter than the inner diameter of the innerflowing passage 31 a so that the above-described resonant space (S1) isable to be located between the outer circumference of the first smalldiameter unit 412 and the inner flowing passage 31 a of the piston 31.

Also, it is desirable that an outward flange unit 412 a is formed on endof the first small conduit unit 412 so that the efficiency of theresonant space (S1) can be increased.

Also, the middle guide conduit 430 and the second guide conduit 420 maybe disposed conversely.

As described above, in case of the embodiments shown in FIGS. 10 and 11,the first large conduit unit 410 and the second large conduit unit 421attenuate the noise, whereby the noise is reduced more efficiently. Inparticular, as shown in FIG. 11, the small conduit unit 412 is insertedinto the inner flowing passage 31 a of the piston 31, whereby formingthe resonant space (S1) with the piston 31. Therefore the noise of lowfrequency is able to be reduced in the resonant space (S1), whereby theefficiency of reducing noise can be increased more.

In addition to the effect described above, the present embodiment hassame structure and effects as those of the embodiments describedearlier, and the detailed descriptions for that are omitted.

INDUSTRIAL APPLICABILITY

As described above, in the suction gas guide system for thereciprocating compressor according to the present invention, the gasguide conduit having both ends installed on the suction pipe of theshell and on the inner flowing passage of the piston facing each otherand having the resonant space, is installed on same axial line so thatthe sucked gas inside the shell through the suction pipe is guided tothe inner flowing passage of the piston disposed on inner side of themotor, whereby the refrigerant gas is sucked smoothly into the innerflowing passage through the gas guide conduit, and therefore the suctionrate of the refrigerant gas is increased. In addition, the noise andvibration generated during suction of the refrigerant gas is attenuatedin the resonant space and therefore the flow resistance against thesucked gas is reduced, whereby the efficiency and the reliability of thecompressor is increased.

Also, the pre-heating of the refrigerant gas being sucked into the shellby the motor is prevented, and the specific volume of the refrigerantgas is not increased, whereby the efficiency of the compressor is ableto be increased.

Also, the gas guide conduit is assembled after the components aremolded, and therefore the assembling process of the gas guide conduit iseasy to be performed, whereby the productivity is able to be increased.

As the present invention may be embodied in several forms withoutdeparting from the spirit or essential characteristics thereof, itshould also be understood that the above-described embodiments are notlimited by any of the details of the foregoing description, unlessotherwise specified, but rather should be construed broadly within itsspirit and scope as defined in the appended claims, and therefore allchanges and modifications that fall within the meets and bounds of theclaims, or equivalence of such meets and bounds are therefore intendedto be embraced by the appended claims.

1. A reciprocating compressor comprising: a shell in which a suctionpipe and a discharge conduit are communicated; a reciprocating motorcomprising a stator which includes an inner stator and an outer statorinstalled inside the shell with a certain air gap, and an armaturedisposed in the air gap between the two stators, the armature forundergoing reciprocating movement; a compressor unit including a pistoncoupled to the armature of the reciprocating motor for undergoingreciprocating movement together with the armature, and having an innerflowing passage formed penetrating inside, and a cylinder supportedinside of the reciprocating motor so that the piston is inserted intothe cylinder slidably; a frame unit supporting the reciprocating motorand the compressor unit; a spring unit elastically supporting thearmature of the reciprocating motor toward motion direction; and asuction gas guiding system including a gas guide conduit having a firstend installed in the suction pipe and a second end in the inner flowingpassage of the piston and guiding a sucked gas inside the shell to theinner flowing passage of the piston, and the guide conduit having abaffle unit, in which a bore of a certain size is formed.
 2. The systemaccording to claim 1, wherein the gas guide conduit is located at thesame axial line as that of the suction pipe of the shell.
 3. The systemaccording to claim 1, wherein the gas guide conduit is formed to beinserted into the inner flowing passage of the piston partially orentirely.
 4. The system according to claim 1, wherein a flange unitflanged toward inner surface of the inner flowing passage in the pistonis formed on end of the gas guide conduit.
 5. The system according toclaim 1, wherein the gas guide conduit includes a first guide conduitextended toward inside of the inner flowing passage of the piston, and asecond guide conduit extended toward the frame located between thepiston and the suction pipe so as to communicate with the first guideconduit.
 6. The system according to claim 5, wherein a large conduitunit, in which the diameter is enlarged, is included at least on one ofthose the first and second guide conduits.
 7. The system according toclaim 5, wherein one of those first and second guide conduits isinserted into the other conduit so as to be overlapped in a certainrange.
 8. The system according to claim 5, wherein the first guideconduit is fixed on the piston, the second guide conduit is fixed on theframe located between the piston and the suction pipe, and one of thosefirst and second guide conduits is inserted into the other conduit so asto be overlapped with the other conduit in a certain range.
 9. Thesystem according to claim 7, wherein the first guide conduit is formedto be inserted into the second guide conduit.
 10. The system accordingto claim 6, wherein the baffle unit having the bore of the certain sizeis formed inside the large conduit unit.
 11. The system according toclaim 10, wherein the baffle unit is formed on one of the first andsecond guide conduits, which has larger inner diameter than that of theother guide conduit respectively.
 12. A reciprocating compressorcomprising: a shell in which a suction pipe and a discharge conduit arecommunicated; a reciprocating motor comprising a stator which includesan inner stator and an outer stator installed inside the shell with acertain air gap, and an armature disposed in the air gap between the twostators, and the armature for undergoing reciprocating movement; acompressor unit including a piston coupled to the armature of thereciprocating motor, undergoing reciprocating movement together with thearmature, and having an inner flowing passage formed penetrating inside,and a cylinder supported inside of the reciprocating motor so that thepiston is inserted into the cylinder slidably; a frame unit supportingthe reciprocating motor and the compressor unit; a spring unitelastically supporting the armature of the reciprocating motor towardmotion direction; and a suction gas guiding system including a firstguide conduit communicated to the inner flowing passage of the piston,and a second guide conduit communicated to a bore of the frame disposedbetween the inner flowing passage and the suction pipe among the frameunit, at least one of the first guide conduit and the second guideconduit including a large conduit unit having larger inner diameter thanthat of the other, and a baffle unit having a bore of a certain sizefurther included inside the large conduit unit.
 13. The system accordingto claim 12, wherein a part or entire second guide conduit is insertedinside the first guide conduit and is overlapped with the first guideconduit.
 14. The system according to claim 12, wherein the bore in thebaffle unit has a diameter same as outer diameter of the second guideconduit.
 15. The system according to claim 12, wherein the innerdiameter of the large conduit unit is larger than that of the innerflowing passage of the piston.
 16. The system according to claim 6,wherein a flange unit for supporting the spring unit is formed on one ofthe first guide conduit or the second guide conduit.
 17. The systemaccording to claim 12, wherein the first guide conduit is inserted intothe second guide conduit.
 18. The system according to claims 1, 2, or12, wherein a flange unit is formed on those guide conduits, coupled tothe frame between the piston and the suction pipe or to the piston, andthe other guide conduits are fixed centering around the guide conduitfixed on the frame or on the piston.
 19. The system according to claims6, 10, 12, or 15, wherein the large conduit unit includes a cylindricalconduit unit; and a first side plate unit and a second side plated unitwhich are connected to the both ends of the outer circumference of theconduit unit and have bores with smaller inner diameter than that of theconduit unit; and one of the first and second side plate units is moldedwith the conduit unit as a single body.
 20. The system according toclaim 19, wherein one of the first and second side plate units iscoupled to the conduit unit by using ultrasonic welding or brazingmethod.
 21. The system according to claims 6, 10, 12, or 15, wherein thelarge conduit unit is fixed on the frame facing the suction pipe of theshell.
 22. The system according to claims 1, 2, 4, 5, 8, 12, 14, or 15,wherein the guide conduits are disposed to be located on same axialline.